OpenGL lighting

This is a discussion on OpenGL lighting within the Game Programming forums, part of the General Programming Boards category; Hey peeps, I have tried to make my game have simple lighting which i have seen on many tutorials on ...

  1. #1
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    OpenGL lighting

    Hey peeps,

    I have tried to make my game have simple lighting which i have seen on many tutorials on the web. However, i cant get mine to have the same effect, and i cant work out why. All i want is shininess to be in effect, which i have seen on many screen shots, and also makes the other half of the shape to be darker (shading?), i will show my environment setup:

    Code:
    const GLfloat shininess [] = { 100.0 };
    const GLfloat specular [] = { 1.0, 1.0, 1.0, 1.0 };
    
    const GLfloat LightPos[] = { 1.0, 1.0, 1.0, 0.0 };
    
    
    void glutInit(int argc, char ** argv) 
    
    {
    
      	// Setup the basic GLUT stuff
    
      	
    
    	glutInit(&argc, argv); 						// initialises environment
    
      	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); 	// uses a double buffer - colour mode - 
    
    
    
      	// Create the window
    
      
    
    	glutInitWindowSize(200, 200); 					// creates the window size
    
      	glutInitWindowPosition(100, 150);  				// position of the window on the screen
    
      	glutCreateWindow("3D Draughts");
    
    
    
    	// Register the event callback functions
    
      
    
    	glutDisplayFunc(Display); 					// called everytime it needs to refresh the display
    
    	glutIdleFunc(idle); 						// called when it isnt doing anything
    
    
    
    
    
    	
    
      	glutKeyboardFunc(KeyboardHandler);         			// picks up keyboard strokes
    
    	glutSpecialFunc(SpecKeyHandler);
    
    	
    
    	glutMouseFunc(processMouse);					// mouse movement and clicks
    
    	glutMotionFunc(processMouseActiveMotion);
    
    
    
    
    
    
    
    	glutReshapeFunc(Reshape); 					// called everytime it needs to reshape something
    
    
    
    	orientMe();
    
    
    
    	glClearDepth(1.0f);
    
    	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    
    	glClearColor(0.0, 0.0, 0.0, 0.0);
    
    
    	glShadeModel(GL_SMOOTH);
    
    
    	glEnable(GL_DEPTH_TEST);					// Enabling depth test
    
    
    
    
    	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
    	glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
    	glLightfv(GL_LIGHT0, GL_POSITION, LightPos);
    	
    	glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);	
    	glEnable(GL_COLOR_MATERIAL);
    
    	glLightfv(GL_LIGHT0, GL_POSITION, LightPos);
    
      	glEnable(GL_LIGHTING);
    	glEnable(GL_LIGHT0);						// Enable lighting
    
    	
    
    									// At this point, control is relinquished to the GLUT event handler.
    
      	glutMainLoop();   						// Control is returned as events occur, via the callback functions.
    
       
    
    }
    If anybody could help, it would be a GREAT help, thank you very much.

  2. #2
    Ethernal Noob
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    You didn't draw an object. glColorMaterial sets the lighting attributes for an object drawn thereafter.

    Though I'm not sure, but you should enable before using them. Enable light0 then set its attributes, same with colormaterial. I think it makes it easier to keep track of.

  3. #3
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    Hey,

    Ive created a game, and call draw() in my game.cpp, but i added draw() to my environment setup as well, it doesn't do anything?? maybe i should delete the draw() from my game.cpp??

    Thanks.

  4. #4
    The Right Honourable psychopath's Avatar
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    glutDisplayFunc() looks like it calls Display() in your code, but you say your draw function is draw() ? The display function should be the one calling your rendering code. And why would you call the rendering function on the environment setup?
    Memorial University of Newfoundland
    Computer Science

    Mac and OpenGL evangelist.

  5. #5
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    sorry, ignore what i said before, you are right, it is the way you said it. I just don't understand why the shininess is not affecting the board and draughts on my game. Is their anything wrong with the setup??

  6. #6
    The Right Honourable psychopath's Avatar
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    Try calling this:
    Code:
    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);
    glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
    In the rendering code, and not the setup code. Not sure if it'll matter in your case though. You also may want to try setting the specular componant of the light, like this:
    Code:
    glLightfv(GL_LIGHT0, GL_SPECULAR, youSpecularColour);
    Can't remember for sure if that's required for the specular of the material to take effect or not. It's been a while since I've used standard OpenGL lighting.
    Memorial University of Newfoundland
    Computer Science

    Mac and OpenGL evangelist.

  7. #7
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    no luck :-( it just stays the same....

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